Last name Jonak (Jonak 
, Йонак 
) , worldwide, is quite a rare cognomen. The cognomen Jonak is habitual in Czechia, where it is quite a rare surname, Austria, and Slovakia. In absolute terms, this name is the most popular in Czechia, Poland, and Bangladesh. Also, Jonak is the forename as well as the last name.
| radek jonak Australian actor, AU (b. 1901) |
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| gustav jonak German politician, judge and jurist (1903-1985), DE (b. 1903) |
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damian jonak Polish boxer, PL (b. 1983) |
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| felix jonak AT (b. 1936) |
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| tanja jonak German musician, DE (b. 1970) |
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| kamil jonak researcher ORCID ID = 0000-0002-9975-1458, PL |
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| claudia jonak researcher |
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| józef jonak researcher |
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| jiri jonak researcher |
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| norbert jonak Polish actor, PL (b. 1981) |
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| julius jonak |
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